.m_th_null {
    cursor: poiter;
    width: 30px;
}

.m_th{
    width:18ex;
    text-align: center;
}

.m_th_id{
    width:3ex;
    text-align: right;
}

.m_th_state{
    width:5ex;
    text-align: center;
}

.m_th_title{
    width: 60ex;
    text-align: center;
}